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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '12c111c5e17e06bf7bb3f25301abd4646a046a4c7e49069418c059bcf709cb56' 
  AND token = 'c2/l+DI4dffk65jiX80wA99Ta3HK80kgXCAVk6WBc1Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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