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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fdca6d2778c30d5d6fd7862d2f5bf91f8a7e863fc35bc15bad22bd24b2a0dcfb' 
  AND token = 'VimsPACEH4lwTJ99a9HgHAuoE4gujnWiDJ1RXjOZjjY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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