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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '896a82f4e371315bce89765697674ffea5f9e7857a08d236d123976a6bf67449' 
  AND token = '6F57fFDYlT2e0RB7yYy/uXbmuW4BwweUURIb+D6tCgY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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