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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '58cc8127cf43b36d1a9e63a142e766c4fc6148cdf45fb84ead06905edcc940dc' 
  AND token = 'D4076wIOMkUCo2kkeluv+8LSzDPQXwiPVig7KQe7JQI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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