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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cf308094c7e93117f491158de44c51a22b707e5e7cdfd8986f6fc527a9397bbe' 
  AND token = 'tBcDIeu8LISQvovX+liSyYvnWCx4LjFF1xQwTUBKyrA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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