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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a50c3bf67e97d19d875bfccc514f7e18bbcecdc6ce2c34d666f00aed617261fc' 
  AND token = 'wvy6M/K2w8rx9t1C7MjMfVRttBwVk45f+MppSym/Ioc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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