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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ab886fac7d457d2b6cc292ff86fd4f514a979a6e320deb87f547440fc860c4fc' 
  AND token = 'EQLeuxs7MiWuJE7P4phhbIf0cBQAmjKJ61mt1zJFjPo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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