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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3ddde8f76b1b1962071ebb2b6029cedc0ba8aa207807c727e3ba3366669beaa8' 
  AND token = 'oprPItu/zQBfQFTk6wSBhEP/1SPHVaajELjkofKlhX0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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