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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '00b3fa43970000013e78743e94291cad175128046cc11a6603c80a2f90cdfbe0' 
  AND token = '5pzp6ZOjiRYF0jCyQgbmT6k//PO4Ac/DCON6cyXOy1o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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