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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '094f5b2433ad28459b5d4580035cd76e14f1357d7462321db0ee0c75d5a50a28' 
  AND token = 'S8daUa2XSz2uNw/SsnURsyDDmo0axFZIdBtof5pvSGs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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