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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '68936802fa4bd46bb79a3835c4af8c924620d672b21d9a1d9baa2c76e03841fd' 
  AND token = 'Id+jnpf8kG9l7RhdNWyg81Zx4HpCIKnRSPZ5jaxZwR4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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