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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9094e2ebb1d202c1b68abe6f48f64389478689207e3e98f45f89e2b22dea2c3f' 
  AND token = 'W982tIZIqJ6qLXgJquLPNm7vEM1UkMvPWCIxlepVVWA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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