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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3db9283fc05bfd597ebfb41304fe58a865a08c20f270f645a6a00fd4d47dae09' 
  AND token = '8CZvCgz5gnUmqxS1ClIr2pfIt2RBn8Pg57g0t9VcoMo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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