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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '703bb4282bcd9c68fadcc9db04de0d6a58de4d3fbba4d15dbc41d91f1be77873' 
  AND token = '++f086Ky5u3e3/oVaXEz4ClHbfvH+snzd1szEKQ9GVI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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