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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '14567612c3bb105e1aafa6600d7ad5ea7d4a963c3241cdd266a7812f6d3eb6a8' 
  AND token = 'fdK2LrpIPJcCIUOIAOCe6Y/S15Sji8ayRWnXfvrnyMg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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