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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'baf4ab3b087d2ca569a1d50c2f6b877667cc7627eb79795aaca65d6f9465f213' 
  AND token = '8JOtmOO8l6Bkn2S8/u0LQfItG43NycpZZpdB6qZXsrs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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