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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a2f3e8bfc77e167c48b03e83594333cb8b2ced439c411f4e44625b8caeb68f43' 
  AND token = 'exvop69MDFkrjzVU9BYIFxnvAmBg3OqtivX4n3g6w4o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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