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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ab94aba3b7e9ee17d683de2af6c79d5ce752ed721e1d07fc3442319d7ade7f56' 
  AND token = 'BxUGwc4rxwH0F8lCN571DI4u8Lz0UlUnojNHV0oXwbE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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