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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7a87f5163815d54b8f77c6ab4ffa8903828c5ed2be2464c5f2c62ffa5aafa0bf' 
  AND token = 'MmMu7mAjmeUrZ9hChaElV1J5Hq/gTrUiu6MLihxVI5I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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