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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ec83037ab26923304ae3b9380365082f059a621aa63f10c9bda8099542eed5c4' 
  AND token = 'evS9a7l7KKea6pAjPUdOzaBXBmZxtwDZTjExqXAy/2s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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