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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fd7cbe859e5eb5789c08c2e197dff90d7a6ade2e1e83fb508e01c5b307817673' 
  AND token = 'iKmJg20FAczY6OWRRBL9tDmE6QhAbHG+lXrA/iRBO8Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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