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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8dee1b543ad1faccb189665ab7a0c40364654a275b54cfb23bbe7bb6e11ce65d' 
  AND token = '+lNxTrlPusGqPbHnSsc970YR2X63O0VZWACBS1gH+dk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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