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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '51bfd54dbd8ed7ec8970e5c9c457f4f74d7ace30839d0a2b38db8a9fe5b6090d' 
  AND token = 'XqsnWtbBRd1kzBassEhbO1BxapFlQEZROgl3+fW392M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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