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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dc64f20f11b08f6dd9e807c3baf56c09d6f75d79023c659b64a39007bbba14da' 
  AND token = '2NMka246qGp+KdprUaeQhvRCwb0RvE4RyxGSA3UoJ0w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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