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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd266d15ff06d6116f39da1766ca399f0b8928d684b910b6e45c2f1a785caf117' 
  AND token = 'LnPO2O1yiKwqSY07tpM6Z4rZR+X2V/YRCnrNcLVhFLQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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