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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '023318cced454d1a955d2cb4029995b092dc9f017557f50d8ca0fb0f66d83c3d' 
  AND token = 'MUQTUCTjbqrFH3gIwrMx3q3Y7h3PIlqOXcvWKRK2ewU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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