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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '61dd19aa705aa55b356ddba54a02249c185fa36b6d63bb8510244731e0544bfd' 
  AND token = '7pS7TzBEDP97UxjL06cChlk1MJ4E6Iey6i8OzFhhYRo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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