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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '618c83fe281de494615ed104b3afdf493f478471d237a251272bcaba95f85982' 
  AND token = '2ZLKCBPnKBgGHOH1d2QNnrT9NoOJAm3u7Vf+1T2dYGM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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