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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a833ea66336c923a31d0ca3cbfece1853b18ebda8fe7b67a038802b785be1e76' 
  AND token = '+h0VIVQvoqbbgtaSnS7lbAf/DvhnpuAJ7h7I54+Olo8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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