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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6042e6f5d41fb28bfb839c284a74ca295e406571660e67d6b2212135d233110a' 
  AND token = '9eYlcbtBeMTfzph+v9u6u2eY8/1Pxw5QaULpUL8/NsI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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