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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ae648c0d81c25542b29e83e9e698516056f125fdd588d1607ec879f9e838844b' 
  AND token = '0hjQ/PqgfrgLyebKPzarYoLd1QNJOQNrkU1oi8c58go=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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