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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f5762524e716b95faaded868302fd2e7ff6530308523986e5150b3da9f9dd9ae' 
  AND token = 'LAKnnYnZJegHB8O/mMSJi7cTkNgSIHfRZpW7zrMnv5k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}