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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b3ae8d40ea72073d0c29e396cdac0362ee59233b38a093722c6c0d4fec92993d' 
  AND token = 'CET/Z6WuO7Eb+AmqxXwr4cX+imbvISw/Hsi7oWzYU3A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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