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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8fcc9d0c39b891cec946dc5ae748b4cf670d76e5a547a3eaedf41a01f98e6d1b' 
  AND token = 'yoyXgzJeQEM5EGbjZ8MXVDmjo+E5GblA+3cS9/F87/g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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