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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '29059199ed3254cfb13992aca225eeaf7830a2eebdde1b3fd8991eb8a4a2a2c7' 
  AND token = '5XDc5jxJNzLHzKnWIB9fOLG6alG8M69Y2hKM71I+C+Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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