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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0df19db579c20e7c2ebea46f1ec7048776aed7ec3a29ac9b0565b26e4b7114b9' 
  AND token = 'EMSe5RePTTR+86WS9kR9D53aTLYcvPQ+dbMm9m6rPyA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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