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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd5fa12d6214d5b5dc4233d582be8a1799f1ac230bcc675b49e345ed423ce318a' 
  AND token = '3n+OE6ZNT7RgY71KU+fw2qbEtfBzZB6Ubs+REGtq6AM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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