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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '10bdbe01851161ef555fff1bfb812ff5f3d8b5a2058a322b696a6de6d4bed95a' 
  AND token = 'aklC69zRTnjeQDuS+zNaSWwbDjs8hL3wMEFmvhYJ/1A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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