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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fd668257a72dee68b09afa50dc70a8e64b7f2a915e23dfb8bbb234ead862f86c' 
  AND token = 'v19h9EjiuHhWOIJ1dL2pl1oeMK73p7gl8D44ozqIEqM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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