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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '142827321b82b09ae2737917b2ce74ababb71dbbdbc1d28e1f144ffb7b97caff' 
  AND token = 'BW77JC0cK6N44FYGs0/L2VGuqE+h8zNnaW0seiHTfD4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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