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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '40cd8a02c58781b234b129715d6d979051ff91c8a54042eaa9af0f8b7ddc3066' 
  AND token = 'KUSGMqyA8bRmRQ89vPaSP8ZFTkW7G9ZHz2mWfRDvm/s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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