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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c609bedd08ef2f39ef989f3031f7a1aa33c4dde8d1c4f28532f2e00a1eab913a' 
  AND token = 'YCidJOL7BNHQrzVTpLL33MHqSO6jYh3mCYmJOYXPxg0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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