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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b30ba16e275e817864ae9a215e9aeea5b1ad51eedd5113719a6409fdbb5a864c' 
  AND token = 'hwusoNB1a741Qpw/jOzHeBxcE9CaSbLkZB2MCW0ajT4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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