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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a17b2f8a6ab03fea0f6b75ca24890957faae47acfd0b162debfbccb64cf07885' 
  AND token = 'MHPh6azpM5/I5gXEKbTJOzSxzP5G50ERVvqBDoZDCDo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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