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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'da97374f7336e68d15bd03e7d0c8b2eef76b65af8dbb7fb2fc26ce7e6f04b043' 
  AND token = '2GVZZnrMd8btthtyQKFqxgHc4iwAcvMaYhUdTDYWfjg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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