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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c67be208d187c41b7ec00b913bdb6c50b69a51b616a6995da83077d278f51d70' 
  AND token = 'z+3WWrxff6oFZrcEebFOpfsaKrq8/fka7I7pMyqIVdU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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