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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a149e3b0cb2934118509c56746b24d6faaff15863fdaa4973400cdbfd5c5c676' 
  AND token = 'QNxgI2RX4pnNBuC/jH3qDvItyjsuTsVM6yA6Jt82z1E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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