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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ac9f293fe6325c177accf423721e80b81936d4b6bea67d395ca07aeda4c78c54' 
  AND token = 'qLLf3Oa3jBeZOMEJL8lcJ6J6P13yfyTr45mcueEIYII=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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