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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '90ef58c826290c85858fc0ed4da5e1fd63eeeb7b33c6caa51755c8341d58afcd' 
  AND token = 'gjdQbPgq/fAYO2IGEKgqgSL/vdwG97nLkqs2XYdrn58=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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