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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6caabd0b8151d4ec4c50b0ba164ac15b69edd5b16a9730fef40bab0cbe585a5e' 
  AND token = 'oMG2WhF7B24KufgT24zT3fxbPk1jUdjlm5rBTQjBRYg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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