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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dbe9df997085550172cae151740a300e187480d6ce8a867eef2d53be5c25b0f7' 
  AND token = '4yi7/gY3gVSBV1YAxq/DbONnzxNdKhNMGcPKicz8FDQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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