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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dc41e4f64ee9af5454a8142b6f97940def4555cbcd2df8d6b2bf73f041b7db24' 
  AND token = 'jprkft3Dgglv8x80GTW8I4ykCl0+AH1YBvV11FLKFjc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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