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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b60b8365a9036387e1d5f68ebb558594462877f08f7eb765dc2536e0fbb48ab6' 
  AND token = 'gQYZ86axx7TQ/YEg0RQ0XdnP9H0gbjRkrpt+0Tc3sJU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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