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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f30fa4254906291a5faa9e16652f6003d024c980fb551265e11f7c02e5e1094c' 
  AND token = 'WeMILe4cACV5+eDw/VqfQWSgk4VfCXOxVhZhD8CmeU0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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