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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ddfefc768ec129be2a5f7f5fbde59750be4f455e71f1f212dcf186017e07093f' 
  AND token = 'Rv/PmUXG727tv/gX1KX21oyQiXlKELFT0FKilY5fI8A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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