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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '02507b5441a5101359849ea7e5258fb1d0773123dbf3cade6a64e69db06906ee' 
  AND token = 'KYPnZd5D/+4eejfZehwZITxfBPhN2Z2cxuyxmGXWKsw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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